Advanced sleep phase syndrome (ASPS) is a sleep condition characterized by falling asleep early, usually between 6 p.m. and 8 p.m., and waking up before dawn (usually waking between 1 and 3 a.m., no later than 5 am.). Advanced sleep phase syndrome is a circadian rhythm disorder which is more likely to appear in those over the age of 65. Advanced sleep phase syndrome is usually caused by either poor sleep habits or a stress related factor. If the problem persists for more than four weeks, professional advice should be sought since it may lead to the development of other sleep related disorders like insomnia. It also has been related to daytime sleepiness, fatigue and their is an increase of depression.